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Date: Fri, 18 Jan 2008 22:36:32 -0500 From: "Frank Ch. Eigler" <fche@...hat.com> To: Mathieu Desnoyers <mathieu.desnoyers@...ymtl.ca> Cc: Steven Rostedt <rostedt@...dmis.org>, "Frank Ch. Eigler" <fche@...hat.com>, LKML <linux-kernel@...r.kernel.org>, Ingo Molnar <mingo@...e.hu>, Linus Torvalds <torvalds@...ux-foundation.org>, Andrew Morton <akpm@...ux-foundation.org>, Peter Zijlstra <a.p.zijlstra@...llo.nl>, Christoph Hellwig <hch@...radead.org>, Gregory Haskins <ghaskins@...ell.com>, Arnaldo Carvalho de Melo <acme@...stprotocols.net>, Thomas Gleixner <tglx@...utronix.de>, Tim Bird <tim.bird@...sony.com>, Sam Ravnborg <sam@...nborg.org>, Steven Rostedt <srostedt@...hat.com>, Paul Mackerras <paulus@...ba.org>, Daniel Walker <dwalker@...sta.com> Subject: Re: [RFC PATCH 16/22 -v2] add get_monotonic_cycles Hi - On Fri, Jan 18, 2008 at 06:19:29PM -0500, Mathieu Desnoyers wrote: > [...] > Almost.. I would add : > > static int trace_switch_to_enabled; > > > static inline trace_switch_to(struct task_struct *prev, > > struct task_struct *next) > > { > if (likely(!trace_switch_to_enabled)) > return; > > trace_mark(kernel_schedudule, > > "prev_pid %d next_pid %d prev_state %ld", > > prev->pid, next->pid, prev->pid); > > > > trace_context_switch(prev, next); > > } > > And some code to activate the trace_switch_to_enabled variable (ideally > keeping a refcount). [...] All this complexity is to be justified by keeping the raw prev/next pointers from being sent to a naive tracer? It seems to me way out of proportion. - FChE -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@...r.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
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